The top seeds in the mixed doubles Zhang Nan and Zhao Yunlei reached the quarter-final stage of badminton's Thaihot China Open on Thursday.
The Chinese top seeds beat South Korean duo Lee Yong Dae and Lee So Hee 17-21, 21-13, 21-16 in 58 minutes.
In other mixed doubles action, Third seeds Xu Chen and Ma Jin of China beat South Korea's Yoo Yeon Seong and Chang Ye Na 21-19, 21-15 while Danish fifth seeds Joachim Fischer and Christinna Pedersen thumped Hong Kong duo Chan Alan Yun Lung and Tse Ying Suet 21-13, 21-13.
In an upset, Denmark's unseeded Niclas Nohr and Sara Thygesen beat Chinese eighth seeds Lu Kai and Huang Yaqiong 21-14, 21-17 and Chinese fourth seeds Liu Cheng and Bao Yixin got past Hong Kong's Lee Chun Hei Reginald and Chau Hoi Wah 21-16, 21-14.
English sixth seeds Chris Adcock and Gabrielle Adcock beat Huang Kaixiang and Huang Dongping of China
21-10, 23-21 while China's Liu Yuchen and Ou Dongni had to work hard to beat German duo Michael Fuchs and Birgit Michels 21-18, 13-21, 21-9 in 50 minutes.
In an upset, Praveen Jordan and Debby Susanto of Indonesia beat South Korean seventh seeds Ko Sung Hyun and Kim Ha Na 15-21, 21-11, 21-16.
In men's doubles, fifth seeds Hiroyuki Endo and Kenichi Hayakawa of Japan beat China's Cai Yun and Lu Kai 21-18, 21-13.
In a big upset, China's Wang Yilv and Zhang Wen defeated Indonesian second seeds Mohammad Ahsan and Hendra Setiawan 15-21, 21-11, 21-14 in 43 minutes.
In women's doubles, Danish third seeds Christinna Pedersen and Kamilla Rytter Juhl beat Japan's Naoko Fukuman and Kurumi Yonao 21-10, 21-13 and in an upset Huang Dongping and Ou Dongni of China downed Dutch seventh seeds Eefje Muskens and Selena Piek 21-13, 21-16.
Japanese top seeds Misaki Matsutomo and Ayaka Takahashi beat South Koreans Chae Yoo Jung and Kim So Yeong 14-21, 21-11, 21-5 while Amelia Alicia Anscelly and Soong Fie Cho of Malaysia beat South Korea's Jung Kyung Eun and Shin Seung Chan 21-18, 21-19.